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Finding the Fourth Proportional to 1,259.77, 1,889.55 and 394

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Solution

The fourth proportional to 1,259.77, 1,889.55 and 394 is: 590.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,259.77 : 1,889.55 = 394 : x
  2. Step 2: Convert to fraction form
    1,259.77/1,889.55 = 394/x
  3. Step 3: Cross multiply
    1,259.77x = 1,889.55 × 394
  4. Step 4: Simplify right side
    1,259.77x = 744,482.70
  5. Step 5: Solve for x
    x = 744,482.70/1,259.77
  6. Step 6: Final answer
    x = 590.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.